Stone-polishing wheel.



M PEMBROKE.

STONE POLISHING WHEEL.

APPLIUATIOH Hum APE.25, 190a.

.QQQLL? Patented (Act. 13, 1908.

in m I wiaesfiaar Java/avian seer Av v UNITED STATES I LE COPYSTONE-POLISHING WHEEL.

To all whom it may concern:

Be it known that I, MICHAEL PEMBROKE, a citizen of the United States,residing at Montpelier, county of VV-ashington,- State of Vermont, haveinvented certain new and useful Improvements in Stone-Polishing Wheels,of which the following is aspecification.

' This invention relates to polishing wheels and particularly to a wheelfor olishing granite or similar stone. In whee s of this sort it hasbeen customary to uses. plate provided with flanges of various shapesand forms which work upon the polishing material and reduce the surfaceof the stone :to the pro er condition, and. of the many forms of fangesemployed those of scrol shape'have been found to be of greatadvantage,inasmuch as they tend to gradually drag towardsthe center ofthe wheel the polishing material. The usual polishing. material is madeup of hard chilled iron pellets or shot mixed with sand and'wet withWater.. y One of the great difficulties in the successful operation of ascroll flange wheel is the liability of theshot to lodge under theflange and cause it to run; giving it a ball bearing action during whichthe polishing effect is entirely lost for that ortion of the wheel atleast. Inasmuch as it is found of great advantage to use a uniformspiral flange which. will evenly feed the polishing material towards thecenter of the wheel, I have devised my present invention which, whileretaining the old scroll feature, is so constructed and arranged in itsvarious parts as to aflord all of the advantages ofa continuous scrolland yet obviate the difficulties incident uponthe use of such acontinuous scroll by forming a scroll in successive sections spacedapart in such a way as to make it impossible for the running of theWheel on the shot to occur. This affords a uniform abrasion of thesurface and successfully prevents any tendency to dig or gouge thesurface at any particular part, and further, makes it possible to workup close to the edge of the bed or in the corners where the crowding ofthe mud would make the wheel most liable to run- In the accompanyingspecification; in which my in ention is more fully described, I have setforth as illustrative thereof, an embodiment which is illustrated in thedrawings forming a part of the specification and Specification ofLetters Patent.

to which reference is made by numerals used to indicate correspondingparts throughouta Y ATEN a rsaatdqtey'1' magi? Application filed April25, 1908. Serial No.-429,117.

I In the drawings, F1g11fe1"lS a bottom.

view of my polishinggwheel,"and-Fig. 2 'is a side view of-the samei" Aof the wheel having a central hole 2 which affords an escape for the mudas it works radially towards the center of the wheel. 3 are lugs toreceive the driving shaft.

I 4 are detachable spiral flanges attached to the plate 1 by set screws5. The flanges 4 are provided with the usual sharpened runner shapedforward ends 4 and are arranged successively to form graduallyincreasing spirals from the center outward to the edge of the disk 1. *1preferably provide a double set of flanges 4.

Between the rear end 4 of each flange section l and the forwardsharpened or run- I 1 is a disk which forms the frame or body l nershaped end 4: of the section next following is left a space 6 whichforms breaks in the otherwise uniform spiral. These breaks are arranged.in such a manner that they are covered on each side by the flanges nextwithin and without them and they are preferably arranged just behindtheadvanced end of the flange next outside. In other words, the forward endof each scroll slightly overlaps the rear end of a scroll just withinit. In this way when a shot which has begun to run spirally beneath aflange, is dropped into a space 6 it is met by a mass of mud which hasjust been hooked in by the forward end of the flange next outside of itand which hasjust begun to move inward under the influence of theflange. In this way the shot is deflected and prevented from runningunder the forward end of the flange section which tracks-the sectionwhich it has just left. For thisreason it is possible to use asuccession of flanges which give all the advantages of the continuousuniform spiral and-yet avoid the danger of the continued running of shotunder the flange face.

Various modifications may obviously be made in the number of flangesused in the construction of .the spiral and even variations are possiblein the relative arrangement of the spiral sections and the spacestherebetween, all without departing from the s irit of my invention. I

What I therefore claim and desire to secure by. Letters Patent is: s

1. A polishing wheel comprising a plate, a

' plurality of successively spirally disposed around its center, each ofsaid fla es tracking the flange next in advance of it but being spacedapart therefrom the spaces being continuous.

2. A polishing wheel comprising aplate, a plurality ofspiral flangesdisposedaround a center each of said flanges tracking the flange next inadvance of it and each of said.

flanges having a sharpened forward end the spaces between said flangesforming a con- I tmuo'us channel.

' 3. A polishing wheel comprising a plate, a

plurality of'spiral flanges disposed around a center and comprisingsuccessive flange sections each of said sections tracking. thesecarranged flanges I tion next in advance of it the spaces between theconvolutions of said spiral being continuous.

4. A polishing Wheel comprising a plate, a plurality of successivelyarranged flanges spirally disposed about itscenter each of said flangesections having its forward end slightly overlapping the rear of thesection next within it the spaces between said spirally disposed flangesbeing continuous.

In testimony whereof I aflix my signature in presence of two witnesses.

MICHAEL PEMBROKE.

.l/Vitnesses:

MARIA FRANCES CRANE, HARRY C. SHURTLEFF.

